Edge-trimming machine



c. c. BLAKE.

EDGE TRIMMING MACHINE.

APPLICATION FILED JULY 24, 1915.

1,33 9,87 8. Patented May 11, 1920.

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UNITED STATES PATENT OFFICE.

CHARLES C. BLAKE, OF BROOKLINE, MASSACHUSETTS.

' EDGE-TRIMIVIING MACHINE.

Application filed July 24, 1915.

To ail whom it may concern:

Be it known that I, CHARLES C. BLAKE, a citizen of the United States, residing at Brookline, in the county of Norfolk and State of Massachusetts, have invented a new and useful Improvement in Edge-Trimming Machines, of which the following is a specification.

The present invention relates to edgetrimming machines.

It is well known to those skilled in the art of trimming leather goods that a cylindrical cutter imparts a smooth finish to the trimmed edge of the work which is highly desirable, particularly in trimming the sole edges of boots and shoes. In trimming leather with a cylindrical cutter the stiff .string of waste must be bent at the cutting point so that it can pass into the curved interior of the cutter. This necessary bending of the string and the consequent frictional contact of the string with the interior of the cutter heats the cutter to such a high temperature that the trimmed edge of the leather is burned. This burning of the leather precludes the use of a cylindrical cutter in trimming fine leather goods, such, for instance, as the sole edges of boots and shoes.

The object of the present invention is to provide an edge-trimming machine with means for operating the cylindrical cutter at a safe temperature thus permitting the use of a cylindrical cutter in trimming the sole edges of boots and shoes.

To the accomplishment of this object the present invention contemplates the provision, in an edge-trimming machine provided with a cylindrical cutter, of mechanical means for operating the cutter at a temperature insufficient to burn the trimmed edge of the work.

Broadly considered the means for operating the cutter at a temperature insuflicient to burn the trimmed edge of the work may take any form found desirable or expedi ent. In order to avoid all danger of spoiling the work through the use of a cooling liquid applied to the cutter it 1s preferred to slash the string close to the cutting point and thus divide the string into a number of short wel -connected sections which readily bend with absence of heat into the curved interior of the cutter.

Other features of the invention consist in certain devices, combinations and arrange Specification of Letters Patent.

Patented May 11, 19.20.

Serial No. 41,643.

ments of parts fully set forth hereinafter, the advantages of which will be readily understood by those skilled in the art.

The various features of the present inyention will be readily understood from an inspection of the accompanying drawings, in which,

Figure 1 is a machine;

6 Fig. 2 is a longitudinal sectional elevaion;

Fig. 3 is a front elevation of the cutters; and i Fig. 1 shows a plan, side elevation and end elevation of one of the cutting blades of'the fly cutter.

eferring now to the drawings the work to be trimmed, which in this case is a piece of leather, is supported upon a table 1 pro vided with an adjustable edge gage 2. The table 1 is carried upon an arm 3 which is provided with a fastening device 4 by means of which the arm may be secured in adjusted position upon a shelf 5 formed on the machine frame. Mounted to operate in a slot 6 in the table 1 is a cylindrical knife or cutter 7 (Fig. 2) secured to the front end of a horizontal sleeve shaft 8 which is journaled in bearings carried by the machine frame. The sleeve shaft 8 carries a pulley 9 by means of which the shaft is driven at a high rate of speed from some suitable source of power. The cutter 7 is inclosed in a hood 10 which is connected by a conduit 11 to a suitable exhaust system for removing the scrap from the hood. The cylindrical cutter 7 operates in the usual manner to trim the edge ofwork on a line parallel to the feed.

In order to prevent the excessive heating of the cylindrical cutter 7 caused by the frictional contact of the waste string with the interior surface of the cutter a fly cutter 12 is mounted within the cylindrical cutter 7 to form transverse slashes in the work. As shown in Figs. 1, 2 and 3 the paths of out of the cutters 7 and 12 do not intersect. The slashes produced by the cutter 12 extend from the edge of the work to a line parallel to the cut formed by the cylindrical cutter 7. The cutter 12 slashes the stiff string into plan of an edge-trimming short web-connected sections which readily bend into the interior of the cutter without causing an increase in the temperature of the cylindrical cutter. Thecutter 12 comprises four knife blades 13 which are secured to a spider 14 carried upon the front end of a horizontal shaft 15 mounted within the sleeve shaft 8. The shaft 15 is provided. with a pulley 16 which is smaller than the pulley 9 so that the cutter 12 may be driven at a higher rate of speed than the cutter T from the same source of power.

Each of the blades 13 is provided with a cutting edge 17 (Fig. l) which is curved from the front or leading edge 18 across the plane of rotation of the blade to the rear edge 19. With this construction the cutter 12 comprises a series of propeller blades which, as they are driven at a higher speed than the cylindrical cutter, feed the work to the cylindrical cutter in addition to their normal function of slashing the w rk. As shown in Fig. 3 the cutting edge 17 is inclined away from the interior surface of the cylindrical cutter to prevent accumulation of chips in the space between the cutters.

While the invention has been herein embodied in an edge-trimming machine for trimming leather it has been used with excellent results in trimming the sole edges of boots and shoes, and also for trimming such material as wood, rubber, fiber, cardboard, leather-board, and soft metals, like brass and aluminum.

It will be clear to those skilled in this class of machines and with the general objects of the present invention in view that changes may be made in the details of struc ture, the described and illustrated embodiment thereof being intended as an exploitationof its underlying essentials the features whereof are definitely stated in their true scope in the claims hereto appended.

What is claimed as new, is

1. An edge-trimming machine, having, in combination, a cylindrical edge-trimming cutter, and mechanical means operating upon the string of waste passing into the interior of the cutter for preventing the heat ing of the cutter to a temperature smlicient to burn the trimmed edge oi the work, substantially as described.

' 2. In a machine of the class described the combination with means for trimming the edge of the work, of additional means for forming a-c'ut in the edge of that part of the work which forms the string of lesser depth than the trimming cut, substantially as described.

3. In a machine of the class described the combination with means for trimming the edge of the work, or" additional means for slashing the work from the edge of the work to a line parallel with the trimming cut, substantially as described.

41. In a machine of the class described the I combination with a cylindrical knife for trimming the edge of the work,or" a fly cut. ter for forming a cut in the. edge of the work of lesser depth than the trimming cut, I

substantially as described.

5. In a machine of the class described the combination with means-for trimming the edge of the work, of additional means for simultaneously feeding the work and forming a cut in the work from the edge of the work to a line parallel with the trimming cut, substantially as described.

6. An edge-trimming machine, having, in combination, an edge-trimming cutter for trimming the work, and a second cutter for slashing the string, substantially as described.

7. In a machine of the class described, a pair of nested cutters having transversely arranged non-intersecting paths or" cut, sub stantially as described.

8. In a machine of the class described, a cutter having a path of cut parallel to the line of feed andv a cutter mounted within the first cutter having a path of cut non-intersecting with the path of cut 01" the first cutter, substantially as described.

9. In a machine of the class described, a cutter for trimming the work, and second cutter for partially severing the string, substantially as described.

10. In a machine of the class described, cylindrical knife for trimming the work, and a rotary cutter for partially severing the string, substantially as described.

11. In a machine of the class described, a cylindrical knife for trimming the work, and a rotary cutter mounted within the cylindrical knife for partially severing the string close to its point of separation from the work, substantially as described.

12. An edge-trimming machine, having, in combination, an edge-trimming cutter for trimming the edge of the work, a second cutter for slashing the edge of the work, and means for driving the cutters at different speeds, substantially as described. 1

13. An edge-trimming machine, having, in combination, an edge-trimming cutter for trimming the edge of the work, second cutter lor slashing the edge of the work, and means for driving the second cutter at a higher speed than the first cutter, substan tially as described.

14. In a machine of the class described, a cutter comprising a plurality of separate blades each blade having its cutting edge extending in a curved line across the plane of rotation of the blade, substantially as described.

15. An edge trimming machine, having, in combination, a cylindrical edge trimming cutter and mechanical means acting within the cutter upon the work to recuce the it tion between the waste'string and the cutter.

CHARLES C, BLAKE 

